Hi I'm new here so hope someone can help. I'm not much of a car person, so please be patient.
I have an ML320 CDI 4matic 2009 model.
Last summer the air-con started switching itself off on hot days, while I was driving. The lights on the dashboard go out and then there is a huge noise of fans switching on under the bonnet, as if there's a jet engine under there, while I'm still driving. And the air-con outlets pump boiling hot air, it's like having the heater on full blast. It's really freaky. And hot.
Over winter, it hardly ever happened. Now it's getting warmer again, it's doing it more often, so maybe it's triggered by the thermostat reaching, say 25 degrees or something. My duaghter was driving today and it happened again, and while she was driving along the indicator on the dash said that the temperature of the car was +85 degrees celsius!!!! She was so shocked she said she wished she took a photo of it.
Then, if you keep driving, for no apparent reason at all, it will switch itself back on again, and nice cool air will come out. But you never know when it's going to happen.
It happens several times a day, and I spend about 4 hours each day on the road so it's very uncomfortable even in mildly warm weather, let alone a hot day.
The only way to fix the problem is to whack it HARD with the side of my fist, either on the left or right side of the vertical console. So maybe it's a loose wire or something. This is what got me through last summer, me driving my beautiful car around Sydney, and THUMP, yep, that's got the air-con working, YAY! Must've looked like an idiot.
The dealer workshop has inspected it twice/three times and says there's nothing wrong. LOL. Well, I'm worried that the car's going to blow up, or take off into the air, that's what it feels like and sounds like. What are the fans at the front for? They go into really really high revs, and it's really loud and scary especially for my teenage daughter when she's driving alone which she does every night.
Hope someone can help!!! I know it probably sounds funny but maybe this has happened to someone else?
Thanks in advance